UnknownSelectorError
The Cause
Section titled “The Cause”A well-formed Selector that names no Transaction in the loaded API description — usually because the description moved, or because a component of the Selector is slightly off.
What to do
Section titled “What to do”The error lists the nearest matching Selectors: the same path under the same method first, then the same path under another method. Compare them with what you wrote — the difference is normally a status code or a media part.
npx thymian sampler show 'GET /launches -> 200 (application/json)'sampler show is the quickest way to confirm a Selector’s exact spelling, and it
prints the same suggestions when you get one wrong.
A Selector is never quietly re-bound to a nearby Transaction. That is the point of anchoring a hook to a fully-qualified address.